A Whole-Body Laser Range Scanner

 

Sponsor: Rhodes E-tailors, Inc.

Designers: David Holtkamp and Arthur Goshtasby


A laser range scanner is developed that acquires multiple-view range images of an object and combines the images into a seamless surround image without having to register the images. By manually sweeping a laser line over an object just like painting over the object with a paintbrush, a range image of the object is created. By appropriately adjusting the speed at which the laser is swept over the object, dense points can be recorded in areas where high details are present and sparse points can be obtained in areas where very little detail is present. In the automatic mode, four lasers sweep over the object from four sides in sequence while three cameras simultaneously record the laser stripes to reconstruct the object. An implicit surface is fitted to the range points to represent the scanned object by a smooth and shaded surface. Captured object texture can be mapped to the created surface to construct a realistic model of the object. The scanner scans an object from surround in 10 seconds and creates a model of the object in 30 seconds. The scanner is portable and is self calibrating. Therefore, it can be set up and made operational in a matter of minutes. The hardware for the scanner is also very inexpensive.


An example scan obtained by the scanner is shown below. Fig. 1 shows three views of a manikin as seen by the three cameras during a scan. Fig. 2a shows the reconstructed range scan after implicit surface fitting, and Fig. 2b shows the surface after texture mapping. The scanner software provides tools to measure dimensions of the scanned object for quality control or other purposes. The tools shown in Fig. 3 can be used to electronically take measurements from a person's scanned body.

Description: Description: http://www.cs.wright.edu/people/faculty/agoshtas/pbimg1.jpg

Fig. 1. Three views of a manikin during a scan as seen by the three cameras.

Description: Description: http://www.cs.wright.edu/people/faculty/agoshtas/pbimg2.jpgDescription: Description: http://www.cs.wright.edu/people/faculty/agoshtas/pbimg3.JPG

(a)                                                    (b)

Fig. 2. (a) An implicit surface representing the scanned manikin. (b) Reconstructed manikin after texture mapping.

Description: Description: http://www.cs.wright.edu/people/faculty/agoshtas/pbimg4.JPG

Fig. 3. A measurement tool calculating different dimensions of the scanned manikin.

 

For more information about this laser range scanner, please contact Arthur Goshtasby, CSE Department, Wright State University.